Energy Recovery Devices

Flowserve manufactures the most efficient energy recovery device ever developed for sea water reverse osmosis (SWRO) desalination.


Having equipped desalination plants for more than half a century, Flowserve understands energy is the largest operating cost for any SWRO facility. Flowserve also understands that high-efficiency equipment and especially energy recovery devices are critical to making the process cost-effective.

That’s why in 2009 Flowserve acquired the Swiss company Calder™. Calder specializes in the design, engineering and manufacture of energy recovery devices and related propriety technologies for reverse osmosis desalination.

By bringing together industry-leading pumps, seals, valves and energy recovery devices as well as unmatched materials expertise and application knowledge, Flowserve is the premier provider of complete, integrated flow control solutions for the global SWRO industry.

Calder DWEER™

The Calder DWEER is the most efficient energy recovery device available today and is installed in many of the world’s largest SWRO plants. Able to recover up to 98% of the energy in the brine stream, it is a substantial improvement over alternative power recovery devices and technologies. The result is a significant reduction in an SWRO plant’s operating costs. And, with its unrivaled operational flexibility, robust design, high availability and extremely low maintenance costs, it will continue to provide value for decades. More info…

Reverse Osmosis

Calder ERTs

Calder energy recovery turbines (ERT) are designed and manufactured specifically for reverse osmosis desalination. They can recover as much as 90% of the hydraulic energy remaining in the brine stream, converting it into rotary power for the high-pressure pumps. Highly efficient and reliable, Calder ERTs are installed in nearly 1000 seawater and brackish water reverse osmosis plants worldwide, with a total installed capacity in excess of 350 MW. More info…

Types of Flowserve Energy Recovery Devices

Select a type of Energy Recovery Devices: